Calculation Method about Hydraulic Conductivity of Quaternary Aquitard in Jianghan Plain
Zhang Jingwei
Liang Xing
Ge Qin
Li Hui
Zhu Bo
Abstract：The hydraulic conductivity of aquitard is an important parameter for the regional groundwater flow system and the effect of water-soil-biology in critical zone.Taking the 1 ∶ 50 000 Yanglinwei-Luxikou in Jianghan plain as typical study area combining with the investigation of critical zone,52 sediment samples from different depth and lithology were collected to conduct the laboratorial penetration test with improved permeameter,and amend the empirical formula of clay with K and granularity characteristic parameters.The results show that:the hydraulic conductivity of sediments related to lithology and large variability,range from 10-10 to 10-6 m/s;pore phreatic aquifer group mainly consists of silty clay and clay,hydraulic conductivity and variability is small,sedimentary environment is relatively stable;artesian aquifer group due to the continuous distribution of clay and silt,leading to large hydraulic conductivity and variability,present multicycle sedimentary environment of typical river-lake interaction.Utilize the significant binomial relation with effective pore ratio (eu) and clay content (P),amend Terzaghi's empirical formula,and predicted data and experimental data are coincided basically,the range of specific value is less than an order of magnitude,validating the feasibility of amended Terzaghi's formula in river-lake plain.
Keywords：Jianghan plainhydraulic conductivityclayTerzaghi's empirical formulagroundwaterhydrogeology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 761-770 )